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* doc/libtool.texi (Compile mode): Document potential problem and

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work-around for `-c -o dir/foo.lo'.
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Alexandre Oliva 1999-04-07 06:33:30 +00:00 committed by Alexandre Oliva
parent 5168badef7
commit 0225bec239
2 changed files with 18 additions and 1 deletions
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@ -1,5 +1,8 @@
1999-04-07 Alexandre Oliva <oliva@dcc.unicamp.br>
* doc/libtool.texi (Compile mode): Document potential problem and
work-around for `-c -o dir/foo.lo'.
* tests/dryrun.test: The constant modifications of libtool would
cause main.o to be updated at the wrong time; the new approach is
to modify the libtool script so that it enables dry run depending

16
doc/libtool.texi
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@ -1140,7 +1140,7 @@ If the @samp{-static} option is given, then a @samp{.o} file is built,
even if libtool was configured with @samp{--disable-static}.
Note that the @samp{-o} option is now fully supported. It is emulated
for the platforms that don't support it (by locking and moving the
on the platforms that don't support it (by locking and moving the
objects), so it is really easy to use libtool, just with minor
modifications to your Makefiles. Typing for example
@example
@ -1148,6 +1148,20 @@ libtool gcc -c foo/x.c -o foo/x.lo
@end example
will do what you expect.
Note, however, that, if the compiler does not support @samp{-c} and
@samp{-o}, it is impossible to compile @file{foo/x.c} without
overwriting an existing @file{./x.o}. Therefore, if you do have a
source file @file{./x.c}, make sure you introduce dependencies in your
@file{Makefile} to make sure @file{./x.o} (or @file{./x.lo}) is
re-created after any sub-directory's @file{x.lo}:
@example
x.o x.lo: foo/x.lo bar/x.lo
@end example
This will also ensure that make won't try to use a temporarily corrupted
@file{x.o} to create a program or library. It may cause needless
recompilation on platforms that support @samp{-c} and @samp{-o}
together, but it's the only way to make it safe for those that don't.
@node Link mode
@section Link mode
@cindex link mode